Use BookmarkAppConfirmationView on Mac. Delete the NSAlert Mac uses currently.

chrome/browser/ui/views/frame/browser_view.cc

Index: chrome/browser/ui/views/frame/browser_view.cc
diff --git a/chrome/browser/ui/views/frame/browser_view.cc b/chrome/browser/ui/views/frame/browser_view.cc
index de4fdc639f407f049b99f9912150a3bc09786db9..8a225b4c33d034dfbc9e32cb8606c7e2abd1f498 100644
--- a/chrome/browser/ui/views/frame/browser_view.cc
+++ b/chrome/browser/ui/views/frame/browser_view.cc
@@ -64,7 +64,6 @@
 #include "chrome/browser/ui/views/download/download_in_progress_dialog_view.h"
 #include "chrome/browser/ui/views/download/download_shelf_view.h"
 #include "chrome/browser/ui/views/exclusive_access_bubble_views.h"
-#include "chrome/browser/ui/views/extensions/bookmark_app_confirmation_view.h"
 #include "chrome/browser/ui/views/extensions/extension_keybinding_registry_views.h"
 #include "chrome/browser/ui/views/find_bar_host.h"
 #include "chrome/browser/ui/views/frame/browser_view_layout.h"
@@ -1199,13 +1198,6 @@ void BrowserView::ShowBookmarkBubble(const GURL& url, bool already_bookmarked) {
                                bookmark_bar_view_.get());
 }
 
-void BrowserView::ShowBookmarkAppBubble(
-    const WebApplicationInfo& web_app_info,
-    const ShowBookmarkAppBubbleCallback& callback) {
-  BookmarkAppConfirmationView::CreateAndShow(GetNativeWindow(), web_app_info,
-                                             callback);
-}
-
 autofill::SaveCardBubbleView* BrowserView::ShowSaveCreditCardBubble(
     content::WebContents* web_contents,
     autofill::SaveCardBubbleController* controller,